Graphics driver problems

FIrst I would like to thank everyone involved with this great open source project and their time.

I had installed a hidden windows 10 and a windows 7 decoy system on system partition.

Problem 1: I have installed nvidia graphics drivers on decoy system without any problems. When I try to install graphics drivers on windows 10 installation fails. Other installations have been completed without any problems. What should i do? I tried installation
from cd and also the newest drivers from nvidia website.

Problem 2:

I have hidden and decoy system on 1 partition. I have 2 other partitions left and one needs to be formated and another has all the old data. Both are accesssible by both hidden and decoy system.

I want to assign non formated partition to decoy system and the one with data to hidden system. so I could not access both partition with both systems. What should I do?